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<a href="ostream__log__msg__writer_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#include &quot;<a class="code" href="ostream__log__msg__writer_8hpp.html">flow/log/ostream_log_msg_writer.hpp</a>&quot;</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="preprocessor">#include &quot;<a class="code" href="config_8hpp.html">flow/log/config.hpp</a>&quot;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="string__view_8hpp.html">flow/util/string_view.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="fmt_8hpp.html">flow/util/fmt.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &lt;chrono&gt;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1log.html">flow::log</a></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span>{</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment">// Static initializations.</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="keyword">const</span> std::vector&lt;util::String_view&gt; <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a0b99bff54e9784c072061ba35914d7ce">Ostream_log_msg_writer::S_SEV_STRS</a>({ <span class="stringliteral">&quot;null&quot;</span>, <span class="comment">// Never used (sentinel).</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>                                                                          <span class="stringliteral">&quot;fatl&quot;</span>, <span class="stringliteral">&quot;eror&quot;</span>, <span class="stringliteral">&quot;warn&quot;</span>,</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>                                                                          <span class="stringliteral">&quot;info&quot;</span>, <span class="stringliteral">&quot;debg&quot;</span>, <span class="stringliteral">&quot;trce&quot;</span>, <span class="stringliteral">&quot;data&quot;</span> });</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="keyword">const</span> boost::chrono::system_clock::time_point <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a192af9b871a5243ccd8ece7ba10f46a4">Ostream_log_msg_writer::S_POSIX_EPOCH</a></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>  = boost::chrono::system_clock::from_time_t(0);</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span> </div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment">// Implementations.</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span> </div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a701b932c4f46f1edb96a975ad7076ccf">   38</a></span><a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a701b932c4f46f1edb96a975ad7076ccf">Ostream_log_msg_writer::Ostream_log_msg_writer</a>(<span class="keyword">const</span> <a class="code hl_class" href="classflow_1_1log_1_1Config.html">Config</a>&amp; config, std::ostream&amp; os) :</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>  m_config(config),</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>  m_do_log_func(m_config.m_use_human_friendly_time_stamps</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>                  ? (&amp;<a class="code hl_class" href="classflow_1_1log_1_1Ostream__log__msg__writer.html">Ostream_log_msg_writer</a>::do_log_with_human_friendly_time_stamp)</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>                  : (&amp;<a class="code hl_class" href="classflow_1_1log_1_1Ostream__log__msg__writer.html">Ostream_log_msg_writer</a>::do_log_with_epoch_time_stamp)),</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>  m_os(os),</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>  m_clean_os_state(m_os), <span class="comment">// Memorize this before any messing with formatting.</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>  m_last_human_friendly_time_stamp_str_sz(0)</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>{</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>  <span class="keyword">using </span>std::setfill;</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>  <span class="comment">/* Note: The ostream here is totally unrelated to ostream used elsewhere to create msg in the first place.</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment">   * (In fact, this class shouldn&#39;t have to know anything about that;</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment">   * it receives a msg that is already put together.  I only mention it here in case you&#39;ve been reading Logger</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">   * stuff and get confused.)  In particular, any formatters we use don&#39;t affect that other ostream.  So even</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment">   * if we accidentally left std::hex formatter enabled at the end of this method, that would in no way cause hex</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment">   * output of integer values in the Logger&#39;s user&#39;s message (such as passed to FLOW_LOG_INFO() and friends).</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">   * On the other hand, leaving std::hex on *would* indeed affect the users of m_os, which would indeed</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment">   * be uncivilized of us; consider m_os might be std::cout for example.  However, we&#39;ve been assured that no one</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment">   * uses m_os until we&#39;re done with it; so we only restore the original formatting in our destructor. */</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span> </div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>  <span class="comment">// Set some global formatting.  Since we&#39;ve been promised no cross-use of m_os by outside code, this is enough.</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>  <span class="keywordflow">if</span> (!<a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a9a95b0f429db5e9b19055cf251b063a7">m_config</a>.<a class="code hl_variable" href="classflow_1_1log_1_1Config.html#a1b16be31f5dcfba9536a377c9d29abb6">m_use_human_friendly_time_stamps</a>)</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>  {</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>    <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; setfill(<span class="charliteral">&#39;0&#39;</span>);</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>  }</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>} <span class="comment">// Ostream_log_msg_writer::Ostream_log_msg_writer()</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span> </div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">/* As promised m_clean_os_state dtor will auto-restore any formatting changes we&#39;d made to m_os throughout.</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * This class uses boost::basic_ios_all_saver() (aka Ostream_state) which is explicitly marked as noexcept(false)</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> * in boost 1.84. The fix is to override the noexcept(false) specification to noexcept(true) in this class</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * and let it call std::terminate in case it throws (IMO it shouldn&#39;t throw, but I didn&#39;t study it to the depth). */</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aa05b822916ceb37db219ec73563b146d">   70</a></span><a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aa05b822916ceb37db219ec73563b146d">Ostream_log_msg_writer::~Ostream_log_msg_writer</a>() noexcept</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>{</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>}</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span> </div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aba0a94e36e435aeb67bbc25fee8380f7">   74</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aba0a94e36e435aeb67bbc25fee8380f7">Ostream_log_msg_writer::log</a>(<span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1log_1_1Msg__metadata.html">Msg_metadata</a>&amp; metadata, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> msg)</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>{</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a078336512565196f18debc72acc2e73f">m_do_log_func</a>(<span class="keyword">this</span>, metadata, msg);</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>}</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ab0f5d7c5f289defcded5fa3560059411">   79</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ab0f5d7c5f289defcded5fa3560059411">Ostream_log_msg_writer::do_log_with_epoch_time_stamp</a>(<span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1log_1_1Msg__metadata.html">Msg_metadata</a>&amp; metadata, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> msg)</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>{</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>  <span class="keyword">using </span>std::setw;</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>  <span class="keyword">using </span>std::chrono::duration_cast;</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>  <span class="keyword">using </span>std::chrono::microseconds;</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>  <span class="comment">/* Get POSIX time stamp, a ubiquitous (if not 100% unambiguous, due to leap seconds) way to time-stamp a log</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment">   * line.  Show it as seconds.microseconds with appropriate padding.  POSIX/UTC time is relative to 1/1/1970 00:00.</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment">   *</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment">   * Note: On at least some systems, we can get even better precision than microseconds; at least empirically in some</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment">   * Linuxes one can see (1) system_clock::duration is nanoseconds; and (2) the last 3 digits are not 000.</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment">   * To not worry about it showing up as SSSSSS000 just go with microseconds. */</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span>  <span class="keyword">const</span> <span class="keyword">auto</span> since_epoch = duration_cast&lt;microseconds&gt;(metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a11e04fcee8409b76adb9aaa3108f90e1">m_called_when</a>.time_since_epoch());</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span> </div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>  <span class="keyword">const</span> <span class="keyword">auto</span> usec_since_epoch = since_epoch.count();</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>  <span class="keyword">const</span> microseconds::rep sec = usec_since_epoch / 1000000;</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>  <span class="keyword">const</span> microseconds::rep usec = usec_since_epoch % 1000000;</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span> </div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>  <span class="comment">// sec.usec, padded with zeroes up to 6 digits.  We&#39;ve already set 0 as fill character.  setw(6) affects only one &lt;&lt;.</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; sec &lt;&lt; <span class="charliteral">&#39;.&#39;</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>       &lt;&lt; setw(6) &lt;&lt; usec &lt;&lt; <span class="charliteral">&#39; &#39;</span>;</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>  <span class="comment">// Formatting is essentially back to default now, except &#39;0&#39; fill character which only matters with setw(non-zero).</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span> </div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>  <a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a7ac568ffa478c6fc64775c23b00d3fb3">log_past_time_stamp</a>(metadata, msg);</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span>} <span class="comment">// Ostream_log_msg_writer::do_log_with_epoch_time_stamp()</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span> </div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a53d47232844dc7060ee95b4d831bbe29">  105</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a53d47232844dc7060ee95b4d831bbe29">Ostream_log_msg_writer::do_log_with_human_friendly_time_stamp</a>(<span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1log_1_1Msg__metadata.html">Msg_metadata</a>&amp; metadata, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> msg)</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>{</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a>;</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span>  <span class="keyword">using </span>std::chrono::time_point_cast;</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>  <span class="keyword">using </span>std::chrono::seconds;</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>  <span class="keyword">using </span>std::chrono::system_clock;</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span> </div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>  <span class="comment">// See background in class doc header Impl section; then come back here.</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span> </div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>  <span class="comment">// Keep consistent with S_HUMAN_FRIENDLY_TIME_STAMP_*_SZ_TEMPLATE values.</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>  <span class="keyword">constexpr</span> <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">String_view</a> TIME_STAMP_FORMAT(<span class="stringliteral">&quot;{0:%Y-%m-%d %H:%M:}{1:%S} {0:%z} &quot;</span>);</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>  <span class="comment">// Offset from start of human-friendly time stamp output, where the seconds.subseconds output begins.</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>  <span class="keyword">constexpr</span> <span class="keywordtype">size_t</span> SECONDS_START = <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a63185c1743f22be5de7e453424bca50e">S_HUMAN_FRIENDLY_TIME_STAMP_MIN_SZ_TEMPLATE</a>.size();</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span> </div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>  <span class="comment">/* We just want to print m_called_when in a certain format, including %S which is seconds.subseconds.</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   * However the part up-to (not including) %S rarely changes, yet it is somewhat expensive to compute</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   * each time.  So we remember the formatted string printed in the last call to the present method in</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">   * m_last_human_friendly_time_stamp_str; and in the present call merely splice-in the %S part, saving some cycles.</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment">   *</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment">   * Naturally m_last_human_friendly_time_stamp_str becomes obsolete ~every minute, so we need to re-output it fully,</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment">   * when we detect that m_called_when when m_last_human_friendly_time_stamp_str was last re-output was such that</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">   * the up-to-%S part would have been different and thus is now obsolete.  So step 1 is detecting whether that&#39;s</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   * the case.  To do so we save m_cached_rounded_time_stamp each time this re-output occurs; and in step 1</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">   * compare whether the # of whole seconds in this saved value is different from # of whole seconds in the new</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment">   * m_called_when.  (We could perhaps store/compare minutes, but that&#39;s an extra conversion, and anyway ~every second</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment">   * is rare enough.) */</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>  <span class="keyword">const</span> <span class="keyword">auto</span> rounded_time_stamp = time_point_cast&lt;seconds&gt;(metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a11e04fcee8409b76adb9aaa3108f90e1">m_called_when</a>);</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a716e6a13b113019834de45b28c577a0a">m_cached_rounded_time_stamp</a> != rounded_time_stamp)</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>  {</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>    <span class="comment">/* Need to re-output the whole thing.  In the %S part, output the same thing we would in the</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">     * fast path (the else{} below).</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">     *</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">     * Subtlety: Use localtime() to ensure output in the present time zone, not UTC.</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment">     * It cannot be used for %S to get sub-second resolution, as to_time_t() yields 1-second resolution, so</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="comment">     * just use m_called_when for %S and localtime() for the rest.</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment">     * @todo Maybe there is some way to just force it to print full-precision m_called_when in local time zone?</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">     * (boost.chrono did it, with a switch that would cause it to use either local time zone or UTC in the output;</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">     * but we are not using boost.chrono output anymore for perf reasons; plus one cannot specify a format</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">     * which is a nice feature we can use to expand Ostream_log_msg_writer capabilities in the future.) */</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>    <span class="keyword">const</span> <span class="keyword">auto</span> end = fmt::format_to(<a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a1c32abeff2a91c303a0568df84e9d3fe">m_last_human_friendly_time_stamp_str</a>.begin(),</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>                                    <span class="keyword">static_cast&lt;</span><span class="keyword">const </span>std::string_view&amp;<span class="keyword">&gt;</span>(TIME_STAMP_FORMAT),</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span>                                    fmt::localtime(system_clock::to_time_t(metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a11e04fcee8409b76adb9aaa3108f90e1">m_called_when</a>)),</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>                                    metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a11e04fcee8409b76adb9aaa3108f90e1">m_called_when</a>);</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>    *end = <span class="charliteral">&#39;\0&#39;</span>; <span class="comment">// Perhaps unnecessary, but it&#39;s cheap enough and nice for debugging.</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>    <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a716e6a13b113019834de45b28c577a0a">m_cached_rounded_time_stamp</a> = rounded_time_stamp;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>    <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a128cbd9b57957c6d53ca064228930391">m_last_human_friendly_time_stamp_str_sz</a> = end - <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a1c32abeff2a91c303a0568df84e9d3fe">m_last_human_friendly_time_stamp_str</a>.begin();</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>  }</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>  {</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>    <span class="comment">// m_last_human_friendly_time_stamp_str_sz is already correct, except the %S part needs to be overwritten:</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>    fmt::format_to(<a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a1c32abeff2a91c303a0568df84e9d3fe">m_last_human_friendly_time_stamp_str</a>.begin() + SECONDS_START,</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>                   <span class="stringliteral">&quot;{:%S}&quot;</span>, metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a11e04fcee8409b76adb9aaa3108f90e1">m_called_when</a>);</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>  }</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">String_view</a>(<a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a1c32abeff2a91c303a0568df84e9d3fe">m_last_human_friendly_time_stamp_str</a>.data(), <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a128cbd9b57957c6d53ca064228930391">m_last_human_friendly_time_stamp_str_sz</a>);</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span> </div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>  <a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a7ac568ffa478c6fc64775c23b00d3fb3">log_past_time_stamp</a>(metadata, msg);</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>} <span class="comment">// Ostream_log_msg_writer::do_log_with_human_friendly_time_stamp()</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span> </div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"><a class="line" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a7ac568ffa478c6fc64775c23b00d3fb3">  165</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a7ac568ffa478c6fc64775c23b00d3fb3">Ostream_log_msg_writer::log_past_time_stamp</a>(<span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1log_1_1Msg__metadata.html">Msg_metadata</a>&amp; metadata, <a class="code hl_typedef" href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">util::String_view</a> msg)</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>{</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>  <span class="keyword">using </span>std::flush;</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span> </div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>  <span class="comment">/* time_stamp [&lt;sevr&gt;]: T&lt;thread nickname or ID&gt;: &lt;component&gt;: &lt;file&gt;:&lt;function&gt;(&lt;line&gt;): &lt;msg&gt;</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   * Note: The &quot;&lt;component&gt;: &quot; part is optional at the discretion of Config m_config.  For example the component</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   * may be null, or it may not have been registered in Config. */</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span> </div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>  assert(metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a38ed0fc480839dd1c177fa5a8d59368a">m_msg_sev</a> != <a class="code hl_enumvalue" href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04a9ed9d44ce5760f61ea506d5571343624">Sev::S_NONE</a>); <span class="comment">// S_NONE can be used only as a sentinel.</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span> </div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>  m_os &lt;&lt; &#39;[&#39; &lt;&lt; S_SEV_STRS[static_cast&lt;size_t&gt;(metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a38ed0fc480839dd1c177fa5a8d59368a">m_msg_sev</a>)] &lt;&lt; <span class="stringliteral">&quot;]: T&quot;</span>;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span>  <span class="keywordflow">if</span> (metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a4588cf8c827944e5379c6ad1fd11d6db">m_call_thread_nickname</a>.empty())</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>  {</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span>    <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a278ef30d1bdceb9482c0aef097177c91">m_call_thread_id</a>;</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span>  }</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span>  {</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span>    <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a4588cf8c827944e5379c6ad1fd11d6db">m_call_thread_nickname</a>;</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>  }</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; <span class="stringliteral">&quot;: &quot;</span>;</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span> </div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>  <span class="comment">// As noted, this part may be omitted by Config.</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>  <span class="keywordflow">if</span> (<a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a9a95b0f429db5e9b19055cf251b063a7">m_config</a>.<a class="code hl_function" href="classflow_1_1log_1_1Config.html#a6376bf2af57f655c1cdf00791e6a2f7f">output_component_to_ostream</a>(&amp;<a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a>, metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a9d966ba8a227d1e7af587a8191ccf934">m_msg_component</a>))</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>  {</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>    <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; <span class="stringliteral">&quot;: &quot;</span>;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>  }</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span> </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>  <a class="code hl_variable" href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">m_os</a> &lt;&lt; <a class="code hl_define" href="util_2detail_2util_8hpp.html#aa0a4409a31022ddcb1a30936f59bbc69">FLOW_UTIL_WHERE_AM_I_FROM_ARGS</a>(metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a5e7224fd18f1b9b2600508ac399687dd">m_msg_src_file</a>, metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#af7704a632434e7b52c43ab6047cf023b">m_msg_src_function</a>, metadata.<a class="code hl_variable" href="structflow_1_1log_1_1Msg__metadata.html#a2f17801fae328d1fdc070edc2578dd91">m_msg_src_line</a>)</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span>       &lt;&lt; <span class="stringliteral">&quot;: &quot;</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span>       &lt;&lt; msg &lt;&lt; <span class="charliteral">&#39;\n&#39;</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span>       &lt;&lt; flush;</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span>} <span class="comment">// Ostream_log_msg_writer::log_past_time_stamp()</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span>} <span class="comment">// namespace flow::log</span></div>
<div class="ttc" id="aclassflow_1_1log_1_1Config_html"><div class="ttname"><a href="classflow_1_1log_1_1Config.html">flow::log::Config</a></div><div class="ttdoc">Class used to configure the filtering and logging behavior of Loggers; its use in your custom Loggers...</div><div class="ttdef"><b>Definition:</b> <a href="config_8hpp_source.html#l00316">config.hpp:317</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Config_html_a1b16be31f5dcfba9536a377c9d29abb6"><div class="ttname"><a href="classflow_1_1log_1_1Config.html#a1b16be31f5dcfba9536a377c9d29abb6">flow::log::Config::m_use_human_friendly_time_stamps</a></div><div class="ttdeci">bool m_use_human_friendly_time_stamps</div><div class="ttdoc">Config setting: If true, time stamps will include a (deterministically formatted) date,...</div><div class="ttdef"><b>Definition:</b> <a href="config_8hpp_source.html#l00793">config.hpp:793</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Config_html_a6376bf2af57f655c1cdf00791e6a2f7f"><div class="ttname"><a href="classflow_1_1log_1_1Config.html#a6376bf2af57f655c1cdf00791e6a2f7f">flow::log::Config::output_component_to_ostream</a></div><div class="ttdeci">bool output_component_to_ostream(std::ostream *os, const Component &amp;component) const</div><div class="ttdoc">An output of Config, this writes a string representation of the given component value to the given os...</div><div class="ttdef"><b>Definition:</b> <a href="config_8cpp_source.html#l00152">config.cpp:152</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html">flow::log::Ostream_log_msg_writer</a></div><div class="ttdoc">Utility class, each object of which wraps a given ostream and outputs discrete messages to it adorned...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00102">ostream_log_msg_writer.hpp:104</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a078336512565196f18debc72acc2e73f"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a078336512565196f18debc72acc2e73f">flow::log::Ostream_log_msg_writer::m_do_log_func</a></div><div class="ttdeci">const Function&lt; void(Ostream_log_msg_writer *, const Msg_metadata &amp;, util::String_view)&gt; m_do_log_func</div><div class="ttdoc">Pointer to function that log() will forward to when invoked.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00215">ostream_log_msg_writer.hpp:215</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a0b99bff54e9784c072061ba35914d7ce"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a0b99bff54e9784c072061ba35914d7ce">flow::log::Ostream_log_msg_writer::S_SEV_STRS</a></div><div class="ttdeci">static const std::vector&lt; util::String_view &gt; S_SEV_STRS</div><div class="ttdoc">Mapping from Sev to its brief string description.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00186">ostream_log_msg_writer.hpp:186</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a128cbd9b57957c6d53ca064228930391"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a128cbd9b57957c6d53ca064228930391">flow::log::Ostream_log_msg_writer::m_last_human_friendly_time_stamp_str_sz</a></div><div class="ttdeci">size_t m_last_human_friendly_time_stamp_str_sz</div><div class="ttdoc">Length of string in m_last_human_friendly_time_stamp_str (excluding any NUL).</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00229">ostream_log_msg_writer.hpp:229</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a192af9b871a5243ccd8ece7ba10f46a4"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a192af9b871a5243ccd8ece7ba10f46a4">flow::log::Ostream_log_msg_writer::S_POSIX_EPOCH</a></div><div class="ttdeci">static const boost::chrono::system_clock::time_point S_POSIX_EPOCH</div><div class="ttdoc">Jan 1, 1970, 00:00.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00189">ostream_log_msg_writer.hpp:189</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a1c32abeff2a91c303a0568df84e9d3fe"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a1c32abeff2a91c303a0568df84e9d3fe">flow::log::Ostream_log_msg_writer::m_last_human_friendly_time_stamp_str</a></div><div class="ttdeci">std::array&lt; char, S_HUMAN_FRIENDLY_TIME_STAMP_MIN_SZ_TEMPLATE.size()+S_HUMAN_FRIENDLY_TIME_STAMP_REST_SZ_TEMPLATE.size()+1 &gt; m_last_human_friendly_time_stamp_str</div><div class="ttdoc">Buffer storing the last log() time stamp in human-friendly form, including a NUL at the end.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00226">ostream_log_msg_writer.hpp:226</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a53d47232844dc7060ee95b4d831bbe29"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a53d47232844dc7060ee95b4d831bbe29">flow::log::Ostream_log_msg_writer::do_log_with_human_friendly_time_stamp</a></div><div class="ttdeci">void do_log_with_human_friendly_time_stamp(const Msg_metadata &amp;metadata, util::String_view msg)</div><div class="ttdoc">log() implementation with time stamp = date/time with microsecond+ resolution/time zone,...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8cpp_source.html#l00105">ostream_log_msg_writer.cpp:105</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a63185c1743f22be5de7e453424bca50e"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a63185c1743f22be5de7e453424bca50e">flow::log::Ostream_log_msg_writer::S_HUMAN_FRIENDLY_TIME_STAMP_MIN_SZ_TEMPLATE</a></div><div class="ttdeci">static constexpr util::String_view S_HUMAN_FRIENDLY_TIME_STAMP_MIN_SZ_TEMPLATE</div><div class="ttdoc">Example human-readable time stamp output, up to but excluding seconds, for compile-time size calculat...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00192">ostream_log_msg_writer.hpp:192</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a701b932c4f46f1edb96a975ad7076ccf"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a701b932c4f46f1edb96a975ad7076ccf">flow::log::Ostream_log_msg_writer::Ostream_log_msg_writer</a></div><div class="ttdeci">Ostream_log_msg_writer(const Config &amp;config, std::ostream &amp;os)</div><div class="ttdoc">Constructs object wrapping the given ostream.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8cpp_source.html#l00038">ostream_log_msg_writer.cpp:38</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a716e6a13b113019834de45b28c577a0a"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a716e6a13b113019834de45b28c577a0a">flow::log::Ostream_log_msg_writer::m_cached_rounded_time_stamp</a></div><div class="ttdeci">std::chrono::time_point&lt; std::chrono::system_clock, std::chrono::seconds &gt; m_cached_rounded_time_stamp</div><div class="ttdoc">As used in the caching-for-perf algorithm in do_log_with_human_friendly_time_stamp(),...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00237">ostream_log_msg_writer.hpp:237</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a7ac568ffa478c6fc64775c23b00d3fb3"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a7ac568ffa478c6fc64775c23b00d3fb3">flow::log::Ostream_log_msg_writer::log_past_time_stamp</a></div><div class="ttdeci">void log_past_time_stamp(const Msg_metadata &amp;metadata, util::String_view msg)</div><div class="ttdoc">Remainder of log() functionality after either do_log_with_epoch_time_stamp() or do_log_with_human_fri...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8cpp_source.html#l00165">ostream_log_msg_writer.cpp:165</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_a9a95b0f429db5e9b19055cf251b063a7"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#a9a95b0f429db5e9b19055cf251b063a7">flow::log::Ostream_log_msg_writer::m_config</a></div><div class="ttdeci">const Config &amp; m_config</div><div class="ttdoc">Reference to the config object passed to constructor. See notes on thread safety.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00212">ostream_log_msg_writer.hpp:212</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_aa05b822916ceb37db219ec73563b146d"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aa05b822916ceb37db219ec73563b146d">flow::log::Ostream_log_msg_writer::~Ostream_log_msg_writer</a></div><div class="ttdeci">~Ostream_log_msg_writer() noexcept</div><div class="ttdoc">Restores formatting state of os to how it was before entry to constructor.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8cpp_source.html#l00070">ostream_log_msg_writer.cpp:70</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_ab0f5d7c5f289defcded5fa3560059411"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ab0f5d7c5f289defcded5fa3560059411">flow::log::Ostream_log_msg_writer::do_log_with_epoch_time_stamp</a></div><div class="ttdeci">void do_log_with_epoch_time_stamp(const Msg_metadata &amp;metadata, util::String_view msg)</div><div class="ttdoc">log() implementation with time stamp = seconds.microseconds since Epoch.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8cpp_source.html#l00079">ostream_log_msg_writer.cpp:79</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_aba0a94e36e435aeb67bbc25fee8380f7"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#aba0a94e36e435aeb67bbc25fee8380f7">flow::log::Ostream_log_msg_writer::log</a></div><div class="ttdeci">void log(const Msg_metadata &amp;metadata, util::String_view msg)</div><div class="ttdoc">Logs to the wrapped ostream the given message and associated metadata like severity and time stamp; p...</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8cpp_source.html#l00074">ostream_log_msg_writer.cpp:74</a></div></div>
<div class="ttc" id="aclassflow_1_1log_1_1Ostream__log__msg__writer_html_ac37b6d6bbfb5c9feefd35fd78cc66dad"><div class="ttname"><a href="classflow_1_1log_1_1Ostream__log__msg__writer.html#ac37b6d6bbfb5c9feefd35fd78cc66dad">flow::log::Ostream_log_msg_writer::m_os</a></div><div class="ttdeci">std::ostream &amp; m_os</div><div class="ttdoc">Reference to stream to which to log messages.</div><div class="ttdef"><b>Definition:</b> <a href="ostream__log__msg__writer_8hpp_source.html#l00218">ostream_log_msg_writer.hpp:218</a></div></div>
<div class="ttc" id="aconfig_8hpp_html"><div class="ttname"><a href="config_8hpp.html">config.hpp</a></div></div>
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<div class="ttc" id="anamespaceflow_1_1log_html"><div class="ttname"><a href="namespaceflow_1_1log.html">flow::log</a></div><div class="ttdoc">Flow module providing logging functionality.</div><div class="ttdef"><b>Definition:</b> <a href="async__file__logger_8cpp_source.html#l00027">async_file_logger.cpp:28</a></div></div>
<div class="ttc" id="anamespaceflow_1_1log_html_a5c602384e6fe9d7642740ac2fae4ad04a9ed9d44ce5760f61ea506d5571343624"><div class="ttname"><a href="namespaceflow_1_1log.html#a5c602384e6fe9d7642740ac2fae4ad04a9ed9d44ce5760f61ea506d5571343624">flow::log::Sev::S_NONE</a></div><div class="ttdeci">@ S_NONE</div><div class="ttdoc">Sentinel log level that must not be specified for any actual message (at risk of undefined behavior s...</div></div>
<div class="ttc" id="anamespaceflow_1_1util_html_ae4dc52186797094b3040379ff19124c9"><div class="ttname"><a href="namespaceflow_1_1util.html#ae4dc52186797094b3040379ff19124c9">flow::util::String_view</a></div><div class="ttdeci">Basic_string_view&lt; char &gt; String_view</div><div class="ttdoc">Commonly used char-based Basic_string_view. See its doc header.</div><div class="ttdef"><b>Definition:</b> <a href="string__view_8hpp_source.html#l00191">string_view.hpp:191</a></div></div>
<div class="ttc" id="aostream__log__msg__writer_8hpp_html"><div class="ttname"><a href="ostream__log__msg__writer_8hpp.html">ostream_log_msg_writer.hpp</a></div></div>
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<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html">flow::log::Msg_metadata</a></div><div class="ttdoc">Simple data store containing all of the information generated at every logging call site by flow::log...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01040">log.hpp:1041</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a11e04fcee8409b76adb9aaa3108f90e1"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a11e04fcee8409b76adb9aaa3108f90e1">flow::log::Msg_metadata::m_called_when</a></div><div class="ttdeci">std::chrono::system_clock::time_point m_called_when</div><div class="ttdoc">Time stamp from as close as possible to entry into the log call site (usually FLOW_LOG_WARNING() or s...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01112">log.hpp:1112</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a278ef30d1bdceb9482c0aef097177c91"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a278ef30d1bdceb9482c0aef097177c91">flow::log::Msg_metadata::m_call_thread_id</a></div><div class="ttdeci">util::Thread_id m_call_thread_id</div><div class="ttdoc">Thread ID of the thread from which the log call was invoked; or a default-constructed (no-thread) suc...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01137">log.hpp:1137</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a2f17801fae328d1fdc070edc2578dd91"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a2f17801fae328d1fdc070edc2578dd91">flow::log::Msg_metadata::m_msg_src_line</a></div><div class="ttdeci">unsigned int m_msg_src_line</div><div class="ttdoc">Copy of integer that would have come from built-in __LINE__ macro which is auto-invoked by all FLOW_L...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01102">log.hpp:1102</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a38ed0fc480839dd1c177fa5a8d59368a"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a38ed0fc480839dd1c177fa5a8d59368a">flow::log::Msg_metadata::m_msg_sev</a></div><div class="ttdeci">Sev m_msg_sev</div><div class="ttdoc">Severity of message, typically determined by choice of macro (e.g., FLOW_LOG_WARNING() vs.</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01051">log.hpp:1051</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a4588cf8c827944e5379c6ad1fd11d6db"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a4588cf8c827944e5379c6ad1fd11d6db">flow::log::Msg_metadata::m_call_thread_nickname</a></div><div class="ttdeci">std::string m_call_thread_nickname</div><div class="ttdoc">Thread nickname, as for Logger::this_thread_set_logged_nickname(), of the thread from which the log c...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01127">log.hpp:1127</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a5e7224fd18f1b9b2600508ac399687dd"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a5e7224fd18f1b9b2600508ac399687dd">flow::log::Msg_metadata::m_msg_src_file</a></div><div class="ttdeci">util::String_view m_msg_src_file</div><div class="ttdoc">Pointer/length into static-storage string that would have come from built-in __FILE__ macro which is ...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01096">log.hpp:1096</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_a9d966ba8a227d1e7af587a8191ccf934"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#a9d966ba8a227d1e7af587a8191ccf934">flow::log::Msg_metadata::m_msg_component</a></div><div class="ttdeci">Component m_msg_component</div><div class="ttdoc">Component of message, as of this writing coming from either Log_context constructor or FLOW_LOG_SET_C...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01045">log.hpp:1045</a></div></div>
<div class="ttc" id="astructflow_1_1log_1_1Msg__metadata_html_af7704a632434e7b52c43ab6047cf023b"><div class="ttname"><a href="structflow_1_1log_1_1Msg__metadata.html#af7704a632434e7b52c43ab6047cf023b">flow::log::Msg_metadata::m_msg_src_function</a></div><div class="ttdeci">util::String_view m_msg_src_function</div><div class="ttdoc">Analogous to m_msg_src_file but coming from __FUNCTION__, not __FILE__. See m_msg_src_file perf notes...</div><div class="ttdef"><b>Definition:</b> <a href="log_8hpp_source.html#l01105">log.hpp:1105</a></div></div>
<div class="ttc" id="autil_2detail_2util_8hpp_html_aa0a4409a31022ddcb1a30936f59bbc69"><div class="ttname"><a href="util_2detail_2util_8hpp.html#aa0a4409a31022ddcb1a30936f59bbc69">FLOW_UTIL_WHERE_AM_I_FROM_ARGS</a></div><div class="ttdeci">#define FLOW_UTIL_WHERE_AM_I_FROM_ARGS(ARG_file, ARG_function, ARG_line)</div><div class="ttdoc">Helper macro, same as FLOW_UTIL_WHERE_AM_I(), but takes the source location details as arguments inst...</div><div class="ttdef"><b>Definition:</b> <a href="util_2detail_2util_8hpp_source.html#l00112">util.hpp:112</a></div></div>
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